dock: add trash bin button (#2277)

* dock: add trash bin button

- icon reflects content- filled/empty
- multiple file manager support with nautilus as default, builtin as
fallback
- settingsspec at dock tab
- context menu

* fix: remove support for builtin filebrowser

needs specific adaptors at FB adhering the trash freedesktop spec

* fix: suppress auto-hide dock with trash context menu open

* feat: allow for custom file manager command

* feat: switch runner to proc.runcommand with toasts on command failures

quickshell/Common/SettingsData.qml

@@ -545,6 +545,9 @@ Singleton {
     property int dockMaxVisibleApps: 0
     property int dockMaxVisibleRunningApps: 0
     property bool dockShowOverflowBadge: true
+    property bool dockShowTrash: false
+    property string dockTrashFileManager: "nautilus"
+    property string dockTrashCustomCommand: ""
 
     property bool notificationOverlayEnabled: false
     property bool notificationPopupShadowEnabled: true